The invention discloses a disk array system, which comprises n disks, wherein n is more than 4, and errors in less than or equal to t/2 disks are allowed. The memory space of each disk is divided into sectors of 512 bytes or 4k bytes, the sectors with same numbers on each disk are organized into a stripe, the disk array system performs data reading and writing in stripes, the memory space of each sector is uniformly divided into n chunks, preliminary n-t chunks storing effective information are used as information blocks, and last t chunks storing parity information are used as parity blocks. Compared with the prior art, the invention provides the disk array system with non-stop service, high reliability and high fault tolerance, the fault tolerance reaches above 10, non-stop service can be supplied in case of less disk errors, and all data can be recovered in case of a great number of errors.